Software bugs are a fact of life. In today's feature-packed applications, it's no surprise that, given the increasing complexity of many modern programs, something at some point is going to fall over. However, if an app's primary purpose in life is to handle text, you would hope the simple act of typing wouldn't cause it to close.
According to Microsoft, this exact issue is affecting certain installs of Outlook, Word and OneNote, and its Outlook and Office teams are currently investigating (via Neowin). In a support post, MS defines the problem as:
